Expansion-bolt.



G.' D; 'VERNON am. P. MORNINGSTAR. `*EXPA N BOLT. APPLIOATIGN vD SEPT.10. 1908.

939,457. y Patented-Nov. 9, 1909.

INVENTDR'..

WITNESS E5:

ylv

' UNITED srn'rns PATENT- OFFICE.

CHARLES D. VERNON AND JACOB P.,MORNINGS TAR, 0F WHEELING, WEST VIRGINIA;

' SAID MORNING-STAR ASSIGNOR T0 SAID VERNON.`

EXPANSION-BOLT.

Specification of Letters ratent.

Patented Nov. 9, 1909.

Application led September 10, 1908. Serial No. 452,467.

T o all whom 'it may concern: i

Be it known that we, CHARLES D. VERNON Bolts, of which the `following isa specifica-- tion.

This invention relates to improvements in expansion bolts, and moreparticularly to an vexpansion bolt which may be conveniently recoveredwhen occasion requires.I

The primary object of the invention is to provide an expansion boltwhich is particularly adapted for use in threaded holes or sockets andwhich may be readily, removed or recovered from its seated position. Afurther object of the invention is to provide a device of the charactermentioned by means of which a rigid hold may be secured upon acoil-spring, such, for instance, as a trolley-pole supporting-spring,for attachments of parts or objects thereto without unduly weakening thespring. And a still further object of the invention is to provide anexpansion `bolt the censtruction y of which is `such that when it hasbecome seated with an expansion hold, itinay beV manipulated to effectthe taking up of such slack as may exist.

With these and other important objects in view, the invention finally.consists in the particular construction, .arrangement and combination ofparts which will' hereinafter be fully described, reference being hadto,

the accompanying drawing, forming a part of this specification, inwhich-4 l" Figure 1 is a view, partly in'lori'gitudina1' section andpartly 1n yside elevation,@illusf`H trating the application'of 'theinvention to a spring; Fig.v 2 is a perspective view of the key.employed in connection with the spring;A

Fig. 3 is a view illustrating the bolt as employed for seating in athreaded hole or socket; Fig. 4 is a perspective view of the keyemployed in such hole or socket; Fig. 5 is a similar view of a slightlymodified forni of the key shown in Figs. l and 2'; ande-Fig. 6 is asimilar View. of a key still further modified in form. y

Referring to said drawing, in which like reference-characters designatolike parts' throughout. the several viewsui indicates a bolt-body havinga recess l in one side aisocket, fthe key may have on its sui-face-one.ormorestuds", as shown 1n Fig. l, for entering a. pocket providedtherefor at the thereof` forming a shoulder 3 and an inchned face 4, thelatter being inclined outward from said shoulder to or towai'd the.point of the bolt. A wedge-like key 5, of substantially the size andshape of the recess 2' in the bolt, is adapted for mounting in saidrecess with its butt-elid againseit said shoulder 3. The face of saidkey is provided with a vseries of alternate crossribs or spines andnotches which arevspaced' to correspond with the spacing of the threadso the hole or socket to be penetrated, in case the bolt is to beemployed in a -threaded hole or socket; or, in case of a coil-spring,the spines and notches are spaced to correspond with the spacing of thecoils of the spring to he entered or penetrated.

The key may be provided with alternate spines 7 and notches 8 whichextend across to .the other, as shown in Figs. l, 2, 3 and. 4,. in whichcase they have an inclination to the face of the key from one lateraledge correspond with that of the threads or coils to be engaged thereby;or, as shown in Fig. 5, the surface of the key may have formed integraltherewith a plurality of spaced, upright, alined spurs 7a which areadapted to enter the interstices between the coils of a spring whilesaid coils closely embrace the convex surface `of the key. VThe spinesor spurs not only serve to engage the spiral interstices or grooves andthus eifect'uallylock the key in position, preventing chance rctractionofthe bolt, but also serve to admit of the retraction of the bolt andkey when the forineristurned in a reverse direction,

. fthe spines or spurs following the spiral of the article penetrated.'When 'employed in side of the socket. l

In practce,tlie key is inserted in the recess in the bolt with itsbutt-end 6 against the shoulder 3, and the bolt and ke may theneither beto ether forced direct y into position in the lio e, or be' turned o rsci-owed` up in the holewitli the spines or spurs on the face of the keymeshing with the threads oi' vspirals of the article penetrated, theouter und of the bolt beingl grasped for effect/.ing siicli turning.When driven inward the lcsned distance, an outward pull on the bolt.causes the inclined face 4 to slip olf-slide 110 slightly upon thecoinciding face of the key, the latter remaining stationary, resultingin a wedging or gripping pressure being exerted upon the walls of thehole or socket which effectually holds the bolt against withdrawal. Totake up the slack which eklstsafter the outward pull on the bolt, thelatter may be turned to screw the wedge forward into the hole. It ismanifest that the `grip of the bolt' is increased proportionately withthe tensile strain exerted resulting in little or no tendency on thepart of the spring to break. W

As is obvious, thevbolt may be readily withdrawn by simply turning thebolt in a reverse direction so as to effect the turning of the key alongthe spiral path.

Whenthe bolt is intended for use in a threaded hole or socket, thespines and notches are both of V-shape to correspond with the threads ofsuch hole. lVhen intended for `use in a coil-spring, the spines orspursare V-shaped and the intermediate notches are of rounded groove-shape tecorrespond with the size and shape of the coil of `which the spring isformed. Having thus described our invention, what we claim as new, anddesire to secure by Letl. The combination with an article whose interiorwall or surface is provided with a spiral path, of a bolt having aninclined recess in it's side, and slidable means insaidrecess wherebymeshing engagement is had with said spiral path when the bolt issubjected to an outward pull, said'means retain! ing said engagementwhen the bolt is turned forward and drawing said bolt farther into saidarticle.

2. In a device of the character described, a bolt having a recess in theAside thereof,A forming a shoulder and an inclined face,` the latterextending outward from said shoulder vtoward the poi-nt of the bolt, atapered key slidably mounted in said recess, and s iaced transversespines carried by the face oi said keyhsaid key and bolt being adaptedfor freely entering a threaded hole without turning, and said spinesbeing adapted for meshing engagement with the threads of said hole whenthe bolt is partially withdrawn.

3. The combination with an article whose interior wall or surface isprovided with a spiral path, of a bolt having an inclined recess initsside, a key slidably mounted in said recess, and spaced ribs carriedby said key in mesh with the spiral path of said wall.

(et. An expansion bolt adapted for mounting in the end of a coil-spring,said bolt comprising a bolt-body having a recess in its side which formsa shoulder and an inclined face, the latter extending from said shouldertoward the point of the bolt., and a tapered key slidably mounted insaid recess, said key having on its surface spaced upright V- shapedribs meshing with the coils et the spring.

5. An expansion bolt adapted for mount.- ing within the end of acoil-spring. said bolt comprising an unthreaded bolt-body having arecess in its face which forms a shoulder and an inclined face, thelatter extending from said shoulder toward the point of the bolt, awedge-like key slidably mounted in said recess, and a plurality ofcross-ribs in the face of said key adapted to seat in the spiralinterstices of a spring whereby threaded engagement is had between saidkey and said spring, said bolt being adapted to be turned forward forincreasing the depth to which it is seated in the spring, and viceversa.

6. The combination with an article whose interior wall or surface has aspiral path, of a bolt having an inclined recess in its side, a taperedkey slidably mounted in said recess, and means carried by said keywhereby meshing engagement is secured with said spiral path when thebolt is subjected to an outward pull, said means retaining saidengagement and drawing the bolt forward when the latter is turnedforward.

In testimony whereof we atlix our signatures in presence of twowitnesses.

CHARLES D. VERNON. JACOB P. MORNTN G STAR.

wWitnesses:

E. A. Ln'rAnn, H. E DUNLOIA

